Need help with greedy algorithms (Dijkstra's algorithm in particular) please. Will rate answer highly:

Implement Dijkstras algorithm for computing a shortest path from a designated vertex (A) to a designated vertex (B) in a directed graph. Your implementation should use a minimum heap as a supporting data structure. Please follow the instructions below.

Programming languages. You can use any standard programming language such as C, C++, Visual C++, C#, Java, or Python.

Program requirements. Your program should read the graph from a text le (assumed to be in the same folder as the source code) that has the same format as the input les provided below. Each input le starts with a line containing the number of vertices in the graph. The vertices are assumed to be numbered alphabetically starting with vertex A. Each subsequent line in the input le contains the tail of an edge followed by a space, the head of the edge followed by a space, and the weight of the edge, respectively. Your program should output the weight of a shortest path from vertex A to vertex B in the graph and the sequence of vertices on a shortest path from A to B; the format of the output should match the format of the solution les provided below. Note: The starting point is labeled A. The termination point is labeled B.

Input files:

Case1.txt:

10 A J 18 A H 79 A I 81 J G 24 J F 76 G F 2 G H 50 F E 4 E D 2 D H 20 H C 50 I D 6 I C 97 I J 27 C B 22

Case2.txt:

15 A O 100 A G 16 A C 17 A J 2 O B 100 G E 7 C K 10 C M 5 C J 12 K E 11 K G 33 E O 27 E H 25 E L 6 L B 16 L D 32 H B 24 D B 18 J N 14 M O 24 M F 25 F B 3 N F 31 N I 50 I B 34 I D 19

Case3.txt:

20 A D 30 A E 93 A C 79 C I 10 C E 50 D H 32 D E 50 E H 50 E L 14 E J 88 E I 18 L H 50 L I 69 L F 32 L K 78 I J 63 I F 50 H M 55 H K 71 J G 75 J B 92 J N 57 F J 61 F N 53 F K 28 K G 28 K B 86 G Q 3 G B 100 Q B 50 Q P 50 N B 61 N S 26 M O 79 M R 50 R O 23 R T 14 S R 4 S P 50 S Q 50 T P 32 T N 18 P B 50 P N 50

Solution1.txt:

142 A J G F E D H C B

Solution2.txt:

45 A G E L B

Solution3.txt:

214 A D H K G Q B